I think that for the average developer this might be true. I think that for excellent developers, they spend a lot of time thinking about the edge cases and ensuring that the system/code is supportable. i.e. it explains what the problems are so that issue can be resolved quickly; the code is written in a style that provides protection from other parts of the system failing; and so on. This isn't done on average code and I don't see AI doing this at all.